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The procedures for copying lists (see Lists) only produce a flat
copy of the input list, and currently Guile does not even contain
procedures for copying vectors. copy-tree can be used for these
application, as it does not only copy the spine of a list, but also
copies any pairs in the cars of the input lists.
Recursively copy the data tree that is bound to obj, and return a the new data structure.
copy-treerecurses down the contents of both pairs and vectors (since both cons cells and vector cells may point to arbitrary objects), and stops recursing when it hits any other object.